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Get virtual button area in screen coordinates

February 16, 2017 - 8:23am #1



I need to display some text under a virtual button (on the phone screen, I'm making an Android app).


Basically, my code looks like:

VirtualButtonResult buttonResult = imageTargetResult.getVirtualButtonResult(0);
VirtualButton button = buttonResult.getVirtualButton();
Rectangle buttonArea = (Rectangle)button.getArea();


However, I have no idea how to convert the coordinates given by button.getArea(), which are in target coordinates, into screen coordinates.


I read about the projectPoint() method but:

  • What is the pose matrix? How do I get it?
  • projectPoint() takes a Vec3F (X, Y, and Z) but getArea() only provides X and Y coordinates, what am I supposed to put for the Z coordinate?


Thank you!

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